Your credit score can decrease if you pay off your credit card balance or pay it down too quickly. For example, paying off the last $10k on a home loan. The score is also a reflection of your value to them as a paying customer. How much money you can make them, and how reliable you are with regular payments based on past data. These types of businesses may seem off, but if the customer is reliable and makes you money, assigning a low score based simply on the business type is a recipe for litigation.